Re: [BUG REPORT] [mm-hotplug, aio] aio ring_pages can't be offlined

[Andrew Morton]

On Fri, 30 Nov 2012 16:13:16 +0900 Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:

> > What about futexes?
> >
> 
> IIUC, futex's key is now a pair of (mm,address) or (inode, pgoff).
> Then, get_user_page() in futex.c will release the page by put_page().
> 'struct page' is just touched by get_futex_key() to obtain page->mapping info.

Ah yes, that page is unpinned before syscall return.

	grep -rl get_user_pages .

Gad.

These should be audited.  The great majority will be simple and OK,
but drivers/media, drivers/infiniband and net/rds could be problematic.
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